GXT3 Grid Paging toolbar disabled after filtering

Hi, it happened that sometimes using the columns filter, after reloading (applying the filter), the paging tool bar appears disabled.

I'm using GXT 3.04.

The filtering is done in the server side. This happens when using checkbox fields, or when using a text field for filtering. It seems that if you use the filters quickly the grid attempts to reload the data (this is usually when you are writing, you write and then delete and write again). The data is loaded correctly, but the toolbar remains disabled.

However, after the paging toolbar is disabled, if I continue editing the filters value or applying sort, the grid stills works. I don't get any exception, neither in the server side nor in GWT. It seems that all is working, also the next page button still works.